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Theoretical study towards the indirect detection of the axion dark matter by the observation of neutron star

Research Project

Project/Area Number 19K14708
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionTohoku University

Principal Investigator

Naoya Kitajima  東北大学, 学際科学フロンティア研究所, 助教 (50737955)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Discontinued (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords暗黒物質 / アクシオン / 中性子星
Outline of Research at the Start

現在の我々の宇宙を満たす正体不明の「暗黒物質」の解明は自然科学における最重要課題の一つに挙げられるが、本研究では暗黒物質の有力候補「アクシオン」に焦点を当て、近傍宇宙に点在する中性子星の観測を通じてアクシオンの間接的検出が可能かどうかを理論的に検証する。特に中性子星近傍でアクシオンが引き起こす特異な電磁気現象をシミュレーションを用いて解析し、将来の電波望遠鏡による検出可能性を明らかにする。

Outline of Final Research Achievements

In this research project, I have focused on a hypothetical particle “axion” as one of the plausible candidates for the dark matter in our Universe and performed theoretical analysis towards the possibility of indirect detection of the axion with the observation of the neutron star. Particularly focusing on the tiny interaction of the axion with the electromagnetic fields around the neutron star, I have developed numerical simulation code to follow the dynamics of the system.
This code has also been applied for the analysis of resonance phenomena of the axion and gauge fields in the early Universe and consequently we have pointed out a new possibility of the production of the dark photon dark matter and gravitational waves.

Academic Significance and Societal Importance of the Research Achievements

これまでの観測データにより、現在の我々の宇宙は正体不明の暗黒物質で満たされていることが明らかにされており、その正体解明は我々の住む宇宙の起源の解明と密接に結びついている。また、暗黒物質は未知の素粒子であるという説が有力であることから、暗黒物質の検出は素粒子の新理論発見につながる。本研究成果は、暗黒物質の一つの有力な理論モデルについて宇宙の観測対象への示唆を与えたという意味で、既存の理論と将来観測の間の橋渡しを担う。

Report

(3 results)
  • 2021 Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Research-status Report
  • Research Products

    (16 results)

All 2021 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (6 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 6 results,  Open Access: 4 results) Presentation (9 results) (of which Int'l Joint Research: 4 results,  Invited: 3 results)

  • [Int'l Joint Research] ハーバード大学(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Nano-Hz Gravitational-Wave Signature from Axion Dark Matter2021

    • Author(s)
      Kitajima Naoya、Soda Jiro、Urakawa Yuko
    • Journal Title

      Physical Review Letters

      Volume: 126 Issue: 12 Pages: 121301-121301

    • DOI

      10.1103/physrevlett.126.121301

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Can axion clumps be formed in a pre-inflationary scenario?2021

    • Author(s)
      Fukunaga Hayato、Kitajima Naoya、Urakawa Yuko
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2021 Issue: 02 Pages: 015-015

    • DOI

      10.1088/1475-7516/2021/02/015

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Primordial black holes from QCD axion bubbles2020

    • Author(s)
      Kitajima Naoya、Takahashi Fuminobu
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2020 Issue: 11 Pages: 060-060

    • DOI

      10.1088/1475-7516/2020/11/060

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Relic abundance of dark photon dark matter2020

    • Author(s)
      Agrawal Prateek、Kitajima Naoya、Reece Matthew、Sekiguchi Toyokazu、Takahashi Fuminobu
    • Journal Title

      Physics Letters B

      Volume: 801 Pages: 135136-135136

    • DOI

      10.1016/j.physletb.2019.135136

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Stochastic inflation with an extremely large number of e-folds2020

    • Author(s)
      Kitajima Naoya、Tada Yuichiro、Takahashi Fuminobu
    • Journal Title

      Physics Letters B

      Volume: 800 Pages: 135097-135097

    • DOI

      10.1016/j.physletb.2019.135097

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Efficient self-resonance instability from axions2019

    • Author(s)
      Fukunaga Hayato、Kitajima Naoya、Urakawa Yuko
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2019 Issue: 06 Pages: 055-055

    • DOI

      10.1088/1475-7516/2019/06/055

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 重力波で探るアクシオン宇宙2021

    • Author(s)
      北嶋直弥
    • Organizer
      若手による重力・宇宙論研究会2021
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] アクシオン暗黒物質のnHz重力波シグナル2021

    • Author(s)
      北嶋直弥
    • Organizer
      日本物理学会 第76回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Primordial Black Holes from QCD Axion Bubbles2020

    • Author(s)
      北嶋直弥
    • Organizer
      Online JGRG workshop 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] アクシオン暗黒物質のnHz重力波シグナル2020

    • Author(s)
      北嶋直弥
    • Organizer
      第9回観測的宇宙論ワークショップ
    • Related Report
      2020 Annual Research Report
  • [Presentation] Primordial Black Holes from QCD Axion Bubbles2020

    • Author(s)
      北嶋直弥
    • Organizer
      The 14th International Conference on Gravitation, Astrophysics and Cosmology
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] アクシオンの宇宙論と検出実験2019

    • Author(s)
      北嶋直弥
    • Organizer
      第8回観測的宇宙論ワークショップ
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Gravitational waves from axionic gauge field production2019

    • Author(s)
      北嶋直弥
    • Organizer
      JGRG29
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] AXION理論2019

    • Author(s)
      北嶋直弥
    • Organizer
      ダークマターの懇談会2019
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Gravitational wave forest from axons2019

    • Author(s)
      北嶋直弥
    • Organizer
      Axion Cosmology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2023-01-30  

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